<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no,viewport-fit=cover">
    <title>MVC</title>
</head>
<body>
    <div class="page">
    <section id="app1">
         <div class="output">
            <span id="number">100</span>
        </div>
        <div class="actions">
            <button id="add1">+1</button>
            <button id="minus1">-1</button>
            <button id="mul2">*2</button>
            <button id="divide2">÷2</button>
        </div>
    </section>
    <section id="app2">
        <ol class="tab-bar">
            <li>1</li>
            <li>2</li>
        </ol>
        <ol class="tab-content">
            <li>内容1</li>
            <li>内容2</li>
        </ol>
    </section>
    <section id="app3">
        <div class="square"></div>
    </section>
    <section id="app4">
        <div class="circle"></div>
    </section>
  </div>
    <script src="main.js"></script>
</body>
</html>